Question
Consider an alloy that is 14.1% copper by mass in tin. Copper makes up what percentage of the atoms in this sample?
Answers
DrBob222
Take a 100 g sample. That will be 14.1 grams Cu and 85.9 g Sn.
mols Cu = 14.1/63.55 = 0.222
mols Sn = 85.9/118.7 = 0.724
atoms Cu = mols x 6.02E23 = 0.222 x 6.02E23 = 1.34E23
atoms Sn = 0.724 x 6.02E23 = 4.36E23
%Cu by atoms = (atoms Cu/total atoms)*100 = ?
Check all of those numbers including the atomic masses.
mols Cu = 14.1/63.55 = 0.222
mols Sn = 85.9/118.7 = 0.724
atoms Cu = mols x 6.02E23 = 0.222 x 6.02E23 = 1.34E23
atoms Sn = 0.724 x 6.02E23 = 4.36E23
%Cu by atoms = (atoms Cu/total atoms)*100 = ?
Check all of those numbers including the atomic masses.